package com.heima.comment.service.impl;

import com.heima.comment.service.CommentService;

import com.heima.common.exception.CustException;
import com.heima.feigns.UserFeign;
import com.heima.model.comment.dtos.CommentDTO;
import com.heima.model.comment.dtos.CommentLikeDTO;
import com.heima.model.comment.dtos.CommentSaveDTO;
import com.heima.model.comment.pojos.ApComment;
import com.heima.model.comment.pojos.ApCommentLike;
import com.heima.model.comment.vos.ApCommentVo;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.threadlocal.AppThreadLocalUtils;
import com.heima.model.user.pojos.ApUser;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections.CollectionUtils;
import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

@Service
@Slf4j
public class CommentServiceImpl implements CommentService {
    @Autowired
    RedissonClient redissonClient;
    @Autowired
    MongoTemplate mongoTemplate;
    @Autowired
    UserFeign userFeign;

    @Override
    public ResponseResult saveComment(CommentSaveDTO dto) {
        //  1. 校验参数
        // 校验是否登录
        ApUser user = AppThreadLocalUtils.getUser();
        if (user == null) {
            CustException.cust(AppHttpCodeEnum.NEED_LOGIN, "用户不存在");
        }


        //  校验文章id   校验内容不为空  校验内容长度不能大于140个字符 (validated校验)

        // 2. 阿里云校验评论内容是否违规

        // (简单:  此步不做      普通: 阿里云检测有问题提示      高级:  有问题不报异常，替换为**)

        // 3. 远程查询当前登陆用户信息
//        ResponseResult<ApUser> apUserResult = userFeign.findUserById(user.getId());
//       if (apUserResult.getCode()!=0){
//           CustException.cust(AppHttpCodeEnum.PARAM_INVALID,"登录登录信息错误");
//        }

        // 4. 创建评论信息，并保存到mongo
//        Query query = Query.query(Criteria.where("authorId").is(user.getId()).and("content").is(dto.getContent()));
//        ApComment apComment = mongoTemplate.findOne(query, ApComment.class);

        ApComment apComment = new ApComment();
        apComment.setAuthorId(user.getId());
            apComment.setArticleId(dto.getArticleId());
            apComment.setType((short) 0);
            apComment.setContent(dto.getContent());
            apComment.setImage(user.getImage());
//            apComment.setContent(user.getImage());
            apComment.setLikes(0);
            apComment.setType((short) 0);
            apComment.setFlag((short) 0);
            apComment.setCreatedTime(new Date());
            apComment.setUpdatedTime(new Date());
            apComment.setReply(0);
            mongoTemplate.save(apComment);



        return ResponseResult.okResult();
    }

    @Override
    public ResponseResult like(CommentLikeDTO dto) {
        // 1. 参数校验
        ApUser user = AppThreadLocalUtils.getUser();
        if (user == null) {
            CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST, "用户不存在");
        }

        RLock lock = redissonClient.getLock("likes-lock");
        lock.lock();
        //  评论id不能为空  operation必须为 0  或  1
        //  2. 根据评论id查询评论数据， 为返回错误信息
        ApComment apComment1;
        try {
            apComment1 = mongoTemplate.findById(dto.getCommentId(), ApComment.class);
            if (apComment1 == null) {
                CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST);
            }
            if (dto.getOperation() == 0) {
                //  3. 如果是点赞操作 判断是否已经点赞
                Query query = Query.query(Criteria.where("authorId").is(user.getId()).and("commentId").is(dto.getCommentId()));
                ApCommentLike apComment = mongoTemplate.findOne(query, ApCommentLike.class);

                //  点过赞提示 请勿重复点赞
                if (apComment != null) {
                    CustException.cust(AppHttpCodeEnum.DATA_EXIST, "已经点过赞了");
                }
                //  点过赞   保存点赞信息到mongo
                // 并修改评论信息的点赞数量( + 1)

                apComment1.setLikes(apComment1.getLikes() + 1);
                mongoTemplate.save(apComment1);
                ApCommentLike apCommentLike = new ApCommentLike();
                apCommentLike.setAuthorId(user.getId());
                apCommentLike.setCommentId(dto.getCommentId());
                apCommentLike.setOperation(dto.getOperation());
                mongoTemplate.save(apCommentLike);

            } else {
                //   4. 如果是取消点赞操作
                //          删除点赞信息

                //  并修改评论信息的点赞数量( - 1) , 要判断下别减成负数

                apComment1.setLikes(apComment1.getLikes() <= 0 ? 0 : apComment1.getLikes() - 1);
                mongoTemplate.save(apComment1);
                //删除频率点赞信息
                mongoTemplate.remove( Query.query(Criteria.where("authorId").is(user.getId()).and("commentId").is(dto.getCommentId())),ApCommentLike.class);

            }
        } finally {
            lock.unlock();
        }


        //  5. 返回结果时，需要返回点赞点赞数量  返回的key要求必须是:  likes
        Map resultLikes = new HashMap();
        resultLikes.put("likes", apComment1.getLikes());

        return ResponseResult.okResult(resultLikes);
    }


@Override
public ResponseResult findByArticleId(CommentDTO dto) {
    //1 参数检查
    if (dto == null || dto.getArticleId() == null) {
        return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_REQUIRE);
    }
    Integer size = dto.getSize();
    if ( size == null || size <= 0) {
        size = 10;
    }
    //2 查询Mongo文章所有评论列表
    List<ApComment> apCommentList =null;
    if(dto.getIndex().intValue() == 1){ // 文章评论的首页
        //查询热点评论  5
        Query query = Query.query(Criteria.where("articleId").is(dto.getArticleId()).and("flag").is(1)).with(Sort.by(Sort.Direction.DESC, "likes"));
        apCommentList = mongoTemplate.find(query, ApComment.class);
        // 热点集合不为空
        if (CollectionUtils.isNotEmpty(apCommentList)) {
            size = size - apCommentList.size();
        }
        List<ApComment> normalComments = mongoTemplate.find((Query) getQuery(dto, size), ApComment.class);
        apCommentList.addAll(normalComments);
    }else {
        apCommentList = mongoTemplate.find(
                (Query) getQuery(dto,size),
                ApComment.class
        );
    }
    //3 封装查询结果
    //3.1 用户未登录 直接返回评论列表
    ApUser user = AppThreadLocalUtils.getUser();
    if (user == null) {
        return ResponseResult.okResult(apCommentList);
    }

    //3.2 用户登录，需要加载当前用户对评论点赞的列表
    List<ApCommentVo> apCommentVoList = new ArrayList<>();
    // 获取文章对应的所有评论ID列表
    List<String> idList = apCommentList.stream().map(comment -> comment.getId()).collect(Collectors.toList());
    // 查询 点赞批量列表 按照评论id 筛选
    List<ApCommentLike> apCommentLikes = mongoTemplate.find(
            Query.query(Criteria.where("commentId").in(idList)
                    .and("authorId").is(user.getId()))
            , ApCommentLike.class);

    // 遍历当前用户点赞列表 和当前评论列表
    if(CollectionUtils.isNotEmpty(apCommentList)
            && CollectionUtils.isNotEmpty(apCommentLikes)){
        apCommentList.forEach(comment ->{ //遍历所有文章列表ID
            ApCommentVo apCommentVo = new ApCommentVo();
            BeanUtils.copyProperties(comment, apCommentVo);
            //遍历当前用户点赞列表
            apCommentLikes.forEach(apCommentLike ->{
                // 文章评论列表id 和 当前用户点赞评论列表id是否相等
                if (comment.getId().equals(apCommentLike.getCommentId())) {
                    apCommentVo.setOperation((short) 0);
                }
            });
            apCommentVoList.add(apCommentVo);
        });
        return ResponseResult.okResult(apCommentVoList);
    }
    return ResponseResult.okResult(apCommentList);
}

    private Object getQuery(CommentDTO dto, Integer size) {
        return Query.query(Criteria.where("articleId").is(dto.getArticleId())
                .and("flag").is(0).and("createdTime").lt(dto.getMinDate()))
                .limit(size).with(Sort.by(Sort.Direction.DESC, "createdTime"));
    }
}